Understanding Command Modes - Cisco ASR 1000 Configuration Manual

Understanding Command Modes

Understanding Command Modes
You use the CLI to access Cisco IOS XE software. Because the CLI is divided into many different modes,
the commands available to you at any given time depend on the mode that you are currently in. Entering
a question mark (?) at the CLI prompt allows you to obtain a list of commands available for each
command mode.
When you log in to the CLI, you are in user EXEC mode. User EXEC mode contains only a limited
subset of commands. To have access to all commands, you must enter privileged EXEC mode, normally
by using a password. From privileged EXEC mode, you can issue any EXEC command—user or
privileged mode—or you can enter global configuration mode. Most EXEC commands are one-time
commands. For example, show commands show important status information, and clear commands
clear counters or interfaces. The EXEC commands are not saved when the software reboots.
Configuration modes allow you to make changes to the running configuration. If you later save the
running configuration to the startup configuration, these changed commands are stored when the
software is rebooted. To enter specific configuration modes, you must start at global configuration mode.
From global configuration mode, you can enter interface configuration mode and a variety of other
modes, such as protocol-specific modes.
ROM monitor mode is a separate mode used when the Cisco IOS XE software cannot load properly. If
a valid software image is not found when the software boots or if the configuration file is corrupted at
startup, the software might enter ROM monitor mode.
Table 1-3
software. It also shows examples of the prompts displayed for each mode.
Table 1-3 Accessing and Exiting Command Modes
Command
Mode Access Method
User EXEC Log in.
Privileged From user EXEC mode,
EXEC use the enable EXEC
command.
Global From privileged EXEC
configuration mode, use the configure
terminal privileged
EXEC command.
Interface From global
configuration configuration mode,
specify an interface using
an interface command.
ROM monitor From privileged EXEC
mode, use the reload
EXEC command. Press
the Break key during the
first 60 seconds while the
system is booting.
For more information on command modes, refer to the "Using the Command-Line Interface" chapter in
the Cisco IOS Configuration Fundamentals and Network Management Configuration Guide.
Cisco ASR 1000 Series Aggregation Services Routers SIP and SPA Software Configuration Guide
1-6
describes how to access and exit various common command modes of the Cisco IOS XE
Prompt
Router>
Router#
Router(config)#
Router(config-if)#
>
Chapter 1
Exit Method
Use the logout command.
To return to user EXEC mode, use the disable
command.
To return to privileged EXEC mode from global
configuration mode, use the exit or end command.
To return to global configuration mode, use the exit
command.
To return to privileged EXEC mode, use the end
command.
To exit ROM monitor mode, use the continue
command.
Using Cisco IOS XE Software
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